week07 - Ch 4. Chemical Composition Determining Empirical...

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1 Ch 4. Chemical Composition • Determining Empirical and Molecular Formulas • Chemical Composition of Solutions Percent composition of CH 2 O Percent composition of C 6 H 12 O 6 (glucose) C: 40.0% H:6.7% O: 53.3% Empirical and Molecular Formulas • Molecular formula: in the actual number of atoms • Empirical formula: in the simplest ratios of atoms in a compound
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2 Determining Empirical and Molecular Formulas N 2 H 4 N 2 O 4 P 4 O 6 C 6 H 3 Cl 3 C 2 H 2 (acetylene) C 6 H 6 (benzene) Empirical? Molecular formula Determining Empirical Formula from mass% 1. Determine the empirical formula for the mineral covellite, which has the percent composition 66.5% Cu and 33.5% S. Empirical Formula from mass% • Assume having 100 g; % of element Æ g of element • Convert from mass to mol • Find whole number subscripts Molecular Formula from Empirical: Compare exact molecular mass with empirical molecular mass.
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3 A C 6 H 3 Cl 3 molecule contains 6 carbon, 3 hydrogen and 3 chlorine atoms…
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week07 - Ch 4. Chemical Composition Determining Empirical...

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